X and Fluxbox :: Right Alt Key

I'd like my right "ALT" key to actually function as an alt key. "xev" reports that the right hand ALT key is by default doing "keycode 108 (keysym 0xff7e, Mode_switch)". How can I make it do Alt_R?

You can do it with the xmodmap utility. I don't know the program well enough to help with specifics, but the man page should help you.
http://www.die.net/doc/linux/man/man1/xmodmap.1.html

xmodmap -e "keycode 108 = Alt_R"
xmodmap -e "add mod1 = Alt_R"

I forgot one line:

xmodmap -e "remove mod4 = Mode_switch"
xmodmap -e "keycode 108 = Alt_R"
xmodmap -e "add mod1 = Alt_R"

original here.